xuyangzhong opened a new pull request, #27809:
URL: https://github.com/apache/flink/pull/27809
## What is the purpose of the change
This pr contains 2 parts:
1. [FLINK-39286][table] Introduce immutable columns constraint in schema
2. [FLINK-39287][table-planner] Introduce FlinkRelMdImmutableColumns to
implement the derivation logic of some simple nodes and update the logic to
infer upsert key with immutable columns
## Brief change log
- *Introduce immutable constraint in public apis such as Schema,
ResovledSchema, Constraint, etc*
- *Introduce FlinkRelMdImmutableColumns to infer immutable columns for
some simple nodes*
- *Update FlinkRelMdUniqueKeys to infer upsert key with immutable columns*
- *Add tests for all changes*
## Verifying this change
New tests are added to verify this pr.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: yes
- The serializers: no
- The runtime per-record code paths (performance sensitive): no
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? yes
- If yes, how is the feature documented? later
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